"subreplacement" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sub",
        "3": "replacement"
      },
      "expansion": "sub- + replacement",
      "name": "prefix"
    }
  ],
  "etymology_text": "sub- + replacement",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "subreplacement (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with sub-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Demography",
          "orig": "en:Demography",
          "parents": [
            "Sciences",
            "Statistics",
            "All topics",
            "Formal sciences",
            "Mathematics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2011, James W. White, Mirrors of Memory: Culture, Politics, and Time in Paris and Tokyo, University of Virginia Press, page 219",
          "text": "The other is the fact that the population of Japan has begun to shrink, the result of years of subreplacement birth rates.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Below the level needed to maintain the current population."
      ],
      "id": "en-subreplacement-en-adj-pQNav8Kp",
      "links": [
        [
          "demography",
          "demography"
        ],
        [
          "Below",
          "below"
        ],
        [
          "level",
          "level"
        ],
        [
          "population",
          "population"
        ]
      ],
      "raw_glosses": [
        "(demography, of a birth rate) Below the level needed to maintain the current population."
      ],
      "raw_tags": [
        "of a birth rate"
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "demographics",
        "demography"
      ]
    }
  ],
  "word": "subreplacement"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sub",
        "3": "replacement"
      },
      "expansion": "sub- + replacement",
      "name": "prefix"
    }
  ],
  "etymology_text": "sub- + replacement",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "subreplacement (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English terms prefixed with sub-",
        "English terms with quotations",
        "English uncomparable adjectives",
        "en:Demography"
      ],
      "examples": [
        {
          "ref": "2011, James W. White, Mirrors of Memory: Culture, Politics, and Time in Paris and Tokyo, University of Virginia Press, page 219",
          "text": "The other is the fact that the population of Japan has begun to shrink, the result of years of subreplacement birth rates.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Below the level needed to maintain the current population."
      ],
      "links": [
        [
          "demography",
          "demography"
        ],
        [
          "Below",
          "below"
        ],
        [
          "level",
          "level"
        ],
        [
          "population",
          "population"
        ]
      ],
      "raw_glosses": [
        "(demography, of a birth rate) Below the level needed to maintain the current population."
      ],
      "raw_tags": [
        "of a birth rate"
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "demographics",
        "demography"
      ]
    }
  ],
  "word": "subreplacement"
}